/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 */

package org.apache.jmeter.control;

import java.io.Serializable;
import java.util.Iterator;

import org.apache.jmeter.samplers.Sampler;
import org.apache.jmeter.testelement.TestElement;
import org.apache.jmeter.testelement.property.StringProperty;

// For unit tests @see TestSwitchController

/**
 * <p>
 * Implements a controller which selects at most one of its children
 * based on the condition value, which may be a number or a string.
 * </p>
 * <p>
 * For numeric input, the controller processes the appropriate child,
 * where the numbering starts from 0. 
 * If the number is out of range, then the first (0th) child is selected.
 * If the condition is the empty string, then it is assumed to be 0.
 * </p>
 * <p>
 * For non-empty non-numeric input, the child is selected by name.
 * This may be the name of the controller or a sampler.
 * If the string does not match any of the names, then the controller
 * with the name "default" (any case) is processed.
 * If there is no default entry, then unlike the numeric case,
 * no child is selected.
 * </p>
 */
public class SwitchController extends GenericController implements Serializable {
	// Package access for use by Test code
	final static String SWITCH_VALUE = "SwitchController.value"; //$NON-NLS-1$

	public SwitchController() {
		super();
	}

	public Sampler next() {
		if (isFirst()) { // Set the selection once per iteration
			current = getSelectionAsInt();
		}
		return super.next();
	}

	/*
	 * (non-Javadoc)
	 * 
	 * incrementCurrent is called when the current child (whether sampler or controller)
	 * has been processed.
	 * 
	 * Setting it to int.max marks the controller as having processed all its
	 * children. Thus the controller processes one child per iteration.
	 * 
	 * @see org.apache.jmeter.control.GenericController#incrementCurrent()
	 */
	protected void incrementCurrent() {
		current=Integer.MAX_VALUE;
	}

	public void setSelection(String inputValue) {
		setProperty(new StringProperty(SWITCH_VALUE, inputValue));
	}

	/*
	 * Returns the selection value as a int,
	 * with the value set to zero if it is out of range.
	 */
	private int getSelectionAsInt() {
		int ret;
		getProperty(SWITCH_VALUE).recoverRunningVersion(null);
		String sel = getSelection();
		try {
			ret = Integer.parseInt(sel);
			if (ret < 0 || ret >= getSubControllers().size()) {
				ret = 0;
			}
		} catch (NumberFormatException e) {
			if (sel.length()==0) {
				ret = 0;
			} else {
				ret = scanControllerNames(sel);
			}
		}
		return ret;
	}

	private int scanControllerNames(String sel){
		Iterator iter = getSubControllers().iterator();
		int i = 0;
		int default_pos = Integer.MAX_VALUE;
		while(iter.hasNext()) {
			String name;
		    TestElement el = (TestElement)iter.next();
		    name=el.getName();
			if (name.equals(sel)) { 
			    return i; 
			}
     		if (name.equalsIgnoreCase("default")) {  //$NON-NLS-1$
     		    default_pos = i; 
     		}
			i++;
		}
		return default_pos;	
	}

	public String getSelection() {
		return getPropertyAsString(SWITCH_VALUE);
	}
}
